APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Bingcai Chen,Pengpeng Li,Bing Wang,Yingde Wang
CO sensor is helpful to monitor the working state of combustion equipment, such as industrial boilers and engines, and to ensure the production process and human life safety. However, balancing fast response/recovery and high response value for metal oxide CO sensors remains a challenge. In this work, based on band gap engineering, porous TiO 2 /CeO 2 NSs with different TiO 2 coupling amounts were prepared by hydrothermal method combined with flame annealing. The heterojunction composed of TiO 2 and CeO 2 narrowed the energy band width of the composite system and made the electron transmission more efficient, which endowed TiO 2 /CeO 2 NSs with good gas sensing properties. The results indicated that the response value of TiO 2 /CeO 2 NSs is 9.78 time that of CeO 2 NSs. Its ultrafast response/recovery time (2 s/6 s), good CO selectivity and wide CO monitoring range (500 ppb-5000 ppm) are also impressive. The TiO 2 /CeO 2 NSs sensor has great potential for rapid CO monitoring.
研究领域:
材料科学
·
传感器技术
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Wentong Liu,Zunli Mo,Chao Shuai,Simin He,Ruimei Yue,Xudong Guo,Ying Chen,Hui Zheng,Jianchen Zhu,Ruibin Guo,Nijuan Liu
The TiO 2 /CeO 2 /PPS composite coating is prepared by air spraying method. The introduction of TiO 2 and CeO 2 into the PPS substrate significantly improves the corrosion resistance of the composite coating , and the electrochemical corrosion current density reduces two orders of magnitude. The coating is surface-modified with cetyltrimethoxysilane and has good hydrophobicity , so it has excellent anti-fouling and self-cleaning ability. It has the advantages of low processing cost and simple preparation method compared with other anti-corrosion coatings, since the coating is only prepared by a physical mixing method and does not involve complex chemical reactions, which possess the potential for practical application.
研究领域:
材料科学
·
防腐蚀工程
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Xianglei Liu,Chuang Bao,Zhonghui Zhu,Hangbin Zheng,Chao Song,Qiao Xu
Methanol steam reforming (MSR) is considered as an effective method for hydrogen storage and generating high-quality hydrogen for fuel cells. In this work, mesoporous Cu/TiO 2 –CeO 2 catalysts are proposed to achieve efficient MSR based on synergetic effects of thermal and photon energies . Optimal Ti/Ce molar ratio is found to be 2:1, for which excellent methanol conversion of 100% and extremely low CO selectivity of 2.2% are achieved for thermal catalysis. Further applying UV light (280–400 nm) irradiation while keeping the same temperature, the hydrogen production rate is enhanced to be 78.8 mmol/h/g from 58.6 mmol/h/g. The underlying mechanism is attributed to photogenerated electron hole pairs promoting the REDOX reaction of intermediate product methyl formate based on in situ diffuse reflectance infrared fourier transform spectra (DRIFTS). This work provides a new method to enhance methanol steam reforming performance via thermo-photo synergic effects, and paves a way for the development of direct solar driven MSR techniques.
研究领域:
化学工程
·
催化材料科学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2016
·
IF 8.328
Jiabai Cai,Xueqing Wu,Shunxing Li,Fengying Zheng
Visible-light-driven photocatalysis as a green technology has attracted a lot of attention due to its potential applications in environmental remediation. Although TiO 2 is the most popular photocatalyst, the lack of visible light utilization and a low efficiency of electron-hole separation should be overcome. Therefore, Au nanoparticles (NPs) as cocatalyst were controllably loaded between the double-shell or into CeO 2 shell (as photocatalyst and oxygen buffer) and then a novel visible-light-driven TiO 2 @CeO 2 nanocomposite was prepared, using functionalized polystyrene spheres, sol-gel, hydrothermal reaction, and calcination. The presence of TiO 2 shell, Au NPs and CeO 2 shell were confirmed by EDX and electron energy loss mapping analysis. Under visible-light irradiation, the photo-degradation rate constant k (min −1 ) was in the order of TiO 2 @Au@CeO 2 (0.026) > TiO 2 @CeO 2 /Au (0.021) > TiO 2 @CeO 2 (0.014) > CeO 2 (0.0091) > TiO 2 (0.0046) > P25 (0.0034). Compared with P25, TiO 2 @CeO 2 , and TiO 2 @CeO 2 /Au, the visible-light photocatalytic activity of TiO 2 @Au@CeO 2 for the photo-degradation of organic pollutant and photo-reduction of Cr(VI) were the highest. This result was attributed to the combination of TiO 2 and CeO 2 , the double-shelled and sandwiched nanostructure and the addition of Au NPs as electron trap site and surface plasmon resonance-sensitizer, which could reduce the recombination of the electron-hole and induce the visible light absorption. The major obstacle of heterogeneous photocatalysis could be resolved. The photo-degradation rate of 95% was achieved by TiO 2 @Au@CeO 2 , which exhibited an increase of 63% compared to Degussa P25 TiO 2 . The photo-degradation activity of TiO 2 @CeO 2 /Au was improved by Au NPs loaded on outer shell of TiO 2 @CeO 2 /Au but limited by their stability. This work confirmed the importance of controllable location of the noble metals as cocatalysts.
研究领域:
材料科学
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环境科学
·
化学工程
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Xianghong Ren,Yizhi Zeng
Unsymmetrical dimethylhydrazine (UDMH), as a high-energy liquid rocket fuel widely used for space launches, inevitably produces huge volumes of UDMH wastewater during use. As UDMH and its byproducts are both highly toxic, this poses a major threat to the ecological environment and human body, making it an urgent need to develop an efficient, environmentally friendly treatment for UDMH wastewater. Photocatalysis is well recognized for being less costly and more environmentally friendly, yet as traditional photocatalysts are usually available in the form of powder, the photogenerated carriers cannot be well separated or effectively recycled. In this study, a composite photocatalyst featuring a three-dimensional core-shell array structure consisting of a TiO 2 crystal seed layer, a TiO 2 nanorod array core and a CeO 2 nanoparticle shell is created over the surface of recyclable carbon fiber by means of layer-by-layer loading. The TiO 2 rutile/anatase phase heterointerface and TiO 2 /CeO 2 heterointerface allow efficient separation and migration of photogenerated electrons and holes in the three-dimensional space. Under simulated solar irradiation, our new structure degrades 100 mg/L UDMH wastewater by up to 97.3 % within 240 min. More importantly, it shows good reusability and recyclability. Our research offers a practicable option for the efficient degradation of UDMH wastewater.
研究领域:
环境科学
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材料科学
·
化学工程
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Yizhi Zeng,Xianghong Ren
Unsymmetrical dimethylhydrazine is a high-energy liquid rocket fuel widely utilized in the aerospace field. Its highly toxic nature poses a significant threat to the ecosystem and human health, necessitating the urgent development of efficient and environmentally friendly treatment technologies. In this study, a (001) crystal facet-dominated 001-TiO 2 /CeO 2 S-scheme heterojunction was constructed via a solvent hydrothermal-photoassisted method. Under simulated solar light irradiation, the catalyst demonstrated a degradation efficiency of 98.4 % for high-concentration Unsymmetrical dimethylhydrazine wastewater (100 mg/L) within 140 min, while effectively decomposing highly toxic intermediates with a mineralization rate reaching 84.5 %. This is attributed to the synergistic interaction between the crystal facet effect and the S-scheme heterojunction, which significantly enhances the spatial separation and transfer of photogenerated carriers. The intermediate products were identified using solid-phase microextraction coupled with gas chromatography-mass spectrometry (SPME-GC–MS), revealing the possible degradation pathways of Unsymmetrical dimethylhydrazine and elucidating the reaction mechanism. This study offers a viable approach for the efficient degradation of Unsymmetrical dimethylhydrazine wastewater, offering significant reference value for advancing wastewater treatment in the aerospace industry.
研究领域:
环境科学
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材料科学
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化学工程
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航空航天工程
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分析化学
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产品关联
DOI
高影响因子
Catalysts
·
2026
·Vol. 16
·期 7
·660
·
IF 4.5
Libo Tang,Tongxin Wang,Qinyu Zhang,Bing Ma,Yazhou Shuang
Photocatalytic disinfection is a low-cost, efficient, and sustainable technology, particularly suitable for underdeveloped regions. However, its practical application is limited by severe electron-hole recombination, which reduces photocatalytic efficiency, and the poor reusability of powdered catalysts. Although heterojunction design and catalyst immobilization have been employed to address carrier recombination and recyclability, respectively, these two bottlenecks have not yet been simultaneously resolved. In this study, a reusable three-dimensional core-shell array architecture was constructed on a carbon fiber support based on catalyst morphology and disinfection mechanism considerations. The resulting core-shell heterostructure exhibited inactivation indices 2.2 and 2.5 times higher than those of the P25-loaded film and the pristine TiO2 array structure, respectively.
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产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2021
·Vol. 25
·期 7
·1937-1947
·
IF 2.647
Xu Jiawei,Yang Ke,Zhang Xuezhong,Lei Yunfeng,Meng Xiangyu,Wang Zhifei
The detection of glucose plays an important role in monitoring and controlling diabetes as well as its complications caused by high blood glucose levels. There have been a lot of research on glucose sensors and integrated flexible sensing platforms; however, the detection in oxygen-restrictive environments is few reported. Herein, we described the use of a novel system made up of TiO 2 and ceria-cerium phosphate (CeO 2 -CePO 4 ) composite nanostructures synthesized by a simple procedure to address the oxygen dependence problem confronted in the first-generation amperometric glucose biosensors. The enzymatic activity of sensors was tested in both oxygen-rich and restrictive environments. Our results showed that the resulting composites present good electro-catalytic activity towards glucose oxidation. The electrodes decorated by TiO 2 /CeO 2 -CePO 4 showed a wide linear range from 0.1 to 1.7 mM with a low detection limit of 17.1 μM while the CeO 2 -CePO 4 showed the linear range of 0.1–2.5 mM with limit of detection of 58.0 μM in oxygen-rich environment. Two types of decorated electrodes both responded to glucose well under the oxygen-restrictive environment but former showed better response performance. The as-fabricated electrodes also owned the good anti-interference, stability, and reproducibility. This strategy promises for increasing the sensitivity of glucose biosensors and provides more opportunities for operation in oxygen-restrictive conditions. Graphical abstract
研究领域:
生物传感器
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材料科学
·
电化学
·
分析化学
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DOI
高影响因子
Desalination and Water Treatment
·
2026
·
IF 3.4
Hao-Wen Li,Wen-Wen Huang,Guo-Zhi Han
Novel black TiO 2 @CeO 2 heterojunction microparticles were synthesized via a mild solvothermal strategy coupled with calcination. • Narrowed bandgap and Z-scheme heterojunction endow the catalyst with excellent charge separation and transfer efficiency. • This catalyst exhibits excellent performance for simultaneous removal of various antibiotics and dyes. Using tetrabutyl titanate and cerium nitrate hexahydrate as raw materials, a novel kind of black TiO 2 @CeO 2 heterojunction microparticles were rationally synthesized via a mild one-pot solvothermal strategy coupled with calcination in inert atmosphere. Research results indicated that the black TiO 2 @CeO 2 microparticles possessed a narrowed bandgap of 1.62 eV and remarkably enlarged specific surface area. Benefitting from the synergistic effect of TiO 2 and CeO 2 , the composite microparticles exhibited remarkable catalytic degradation performance toward efficient removal of typical synthetic organic dyes and various antibiotics in aqueous solutions. The removal efficiencies of various antibiotics and dyes reached more than 75% within 60 min and more than 65% within 90 min, respectively. In particular, the black TiO 2 @CeO 2 microparticles achieved an overall TCH removal efficiency of 93.9% within 60 min (including dark-adsorption contribution). The apparent rate constant calculated over the subsequent 30 min of illumination was 0.0348 min −1 , demonstrating its favorable photocatalytic activity. Additionally, the dominant active species and charge transfer pathway during photocatalysis were investigated to reveal the intrinsic reaction mechanism. This work provides a facile strategy for constructing high-efficiency composite photocatalysts toward water environmental remediation.
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DOI
高影响因子
JOURNAL OF THE ENERGY INSTITUTE
·
2021
·
IF 6.186
Riyang Shu,Zhuojie Zhong,Hongyun You,Zhipeng Tian,Ying Chen,Longlong Ma
Hydrodeoxygenation (HDO) is an important pathway for lignin-oil upgradation to produce high quality liquid fuels, in which the high-active catalyst is the key point to achieve a high HDO efficiency. In this study, Ru/TiO 2 , Ru/CeO 2 and Ru/TiO 2 –CeO 2 catalysts were synthesized by a novel photochemical method with a high Ru dispersion and used for the HDO of lignin-derived phenolic compounds. Among these three catalysts, Ru/TiO 2 –CeO 2 showed a better performance than Ru/TiO 2 and Ru/CeO 2 . And guaiacol was transformed into cyclohexane with conversion and product selectivity close to 100 % at 230 °C under 1 MPa hydrogen atmosphere. Ru/TiO 2 –CeO 2 took the advantages of Ru/TiO 2 and Ru/CeO 2 , namely high Ru metal dispersion, plenty of medium strength acid sites and abundance of oxygen vacancy , which promoted the guaiacol adsorption and the HDO catalytic activity . Moreover, Ru/TiO 2 –CeO 2 catalyst showed an effective upgrading of other lignin-derived phenolic compounds. And the lignin-oil also enabled to be upgraded efficiently, producing a high content of hydrocarbons and alkylphenols.
研究领域:
化学工程
·
催化材料科学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Jinlong Cui,Chengui Zhang,Yalong Li,Yang Liu,Weijun Jiang,Yuhui Wen,Zhenxi Wang,Zhonghua Yu,Xiangrong Ren,Zhifu Zhang
The selective hydrogenation of cinnamaldehyde (CAL) is a key reaction for producing valuable intermediates in pharmaceuticals, fragrances, and fine chemicals. However, achieving high selectivity toward the C=O bond reduction of CAL under mild conditions remains challenging. In this study, an efficient and sustainable photocatalytic strategy for the selective transfer hydrogenation of cinnamaldehyde to cinnamyl alcohol under mild conditions was reported. The low-loading 0.5 wt% Au/TiO 2 -CeO 2 and 0.5 wt% Pt/TiO 2 -CeO 2 catalysts were prepared by sol–gel and ultraviolet deposition method. Experimental results show that heterojunction is formed by doping CeO 2 with TiO 2 . The light absorption of materials is redshifted, and the separation of photogenerated electron-hole pairs is enhanced, thereby reducing the load usage of precious metal. The 0.5 wt% Au/TiO 2 -CeO 2 catalyst exhibits optimal performance under visible light irradiation, while the 0.5 wt% Pt/TiO 2 -CeO 2 catalyst exhibits excellent activity under ultraviolet light irradiation. The conversion efficiency in 0.5 wt% Au/TiO 2 -CeO 2 catalytic system under visible light is 97.23 %, and the selectivity can reach 96.91 %. Recycling tests verified the structural stability and reusability of the prepared catalysts. The formation of heterojunction structures can effectively reduce the load of precious metal while maintaining high conversion and selectivity. These findings provide a new pathway for achieving highly selective CAL hydrogenation under mild conditions.
研究领域:
催化化学
·
材料科学
·
光催化
·
绿色化学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2025
·
IF 4.7
Yizhi Zeng,Xianghong Ren
Unsymmetrical dimethylhydrazine (UDMH), as a high-energy liquid rocket fuel widely used for energy liquid rocket fuel, inevitably produces huge volumes of UDMH wastewater during use. As UDMH and its byproducts are both highly toxic, this poses a severe threat to ecological environment and human health, making it an urgent need to develop an efficient, environmentally friendly treatment for UDMH wastewater. Photocatalytic technology has emerged as a research hotspot in the field of water pollution control owing to its low cost and eco-friendliness. In this study, a (001) facet-dominated 001-TiO 2 /CeO 2 S-scheme heterojunction was constructed via a solvothermal-photoassisted method, effectively achieving primary carrier separation. Under simulated solar irradiation, this structure achieved a 98.7 % degradation efficiency for 100 mg/L UDMH wastewater within 140 min, with degradation rate constants 3.8 times and 5.5 times higher than those of 001-TiO 2 and P25, respectively. To address the challenge of recovering powdered photocatalysts, this study immobilized the nanopowders using a silver conductive adhesive, creating a two-dimensional conductor interface for electron transport and a nanoparticle structure for hole retention, thereby enabling secondary carrier separation. Under simulated solar irradiation, this immobilized structure achieved a 75.1 % degradation efficiency for 100 mg/L UDMH wastewater within 420 min. More importantly, it demonstrated excellent reusability and recyclability. This study provides a practical and feasible approach for the efficient degradation of UDMH wastewater.
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产品关联
DOI
高影响因子
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